   ;; returns [object Object] in Rhino
   ;; FIXED in my Rhino fork
   (let [cx     (Context/enter)
+        _      (.setLanguageVersion cx 200)
         _      (.setOptimizationLevel cx -1)
         scope  (.initStandardObjects cx)
         source (slurp (io/resource "babel-core/browser.js"))]

        scope  (.initStandardObjects cx)
        source (slurp (io/resource "babel-core/browser.js"))]
    (.evaluateString cx scope
      "Object.getOwnPropertyNames"
      "<cmd>" 1 nil))



  ;; FIXED in my Rhino fork
  (let [cx     (Context/enter)
        _      (.setLanguageVersion cx 200)
        _      (.setOptimizationLevel cx -1)
        scope  (.initStandardObjects cx)
        source (slurp (io/resource "babel-core/browser.js"))]
